I tried SqueakMap with Squeak3.9b-7035 and it appears to be working. Yay! Good work. However, if I doit 'SMSqueakMap bootStrap' from a WorkSpace in a fresh image, it still gives the primitive failed as per <http://bugs.impara.de/view.php?id=3706>. I'm just mentioning this in case it is some sort of clue. VM 3.8.12beta4U.app on Mac G5 with OS X 10.4.6 Ken